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| Navicula ventricosa var. siberica Grunow in Cleve & Grunow 1880 |
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| Navicula ventricosa var. subundulata Grunow in Cleve & Grunow 1880 |
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| Navicula viridis var. icostauron (Ehrenberg) Cleve & Grunow 1880 |
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| Nitzschia acula (acuta) Hantzsch ex Cleve & Grunow 1880 |
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| Nitzschia acuminata var. genuina Cleve & Grunow 1880 |
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| Nitzschia acuminata var. subconstricta Cleve & Grunow 1880 |
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| Nitzschia adriatica Grunow in Cleve & Grunow 1880 |
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| Nitzschia adriatica var. spathulifera Grunow in Cleve & Grunow 1880 |
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| Nitzschia affinis var. upolensis Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphibia var. acutiuscula Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphibia var. australis Cleve & Grunow 1880 |
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| Nitzschia amphibia var. fossilis Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphicephala Grunow in Cleve & Grunow 1880 |
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| Nitzschia amphiprora Grunow in Cleve & Grunow 1880 |
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| Nitzschia angularis var. borealis Grunow in Cleve & Grunow 1880 |
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| Nitzschia angularis var. kariana Grunow in Cleve & Grunow 1880 |
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| Nitzschia angularis var. occidentalis Grunow in Cleve & Grunow 1880 |
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| Nitzschia angustata (angusta) Grunow in Cleve & Grunow 1880 |
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| Nitzschia angustata (angusta) var. acuta Grunow in Cleve & Grunow 1880 |
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| Nitzschia balatonis Grunow in Cleve & Grunow 1880 |
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